Gauge



` March 113, 19311. E, A; ARQNSQN 1,950,912

GAUGE Filed Fe b. 23. 1933 I @MM Patented Mar. 13, 1934 1.95am GAUGE Edward Aron Aronson,

Gary, Ind., assigner to National Tube Company, a corporation o! New Jersey Application February 23, 1933, Serial No. 657,981

2 Claims.

This invention relates to gauges, one or the objects being to accurately measure internal diameters. Other objects may be inferred from the following disclosure oi. the invention in a form particularly adapted to gauge the internal thread of a pipe coupling.

Referring to the accompanying drawing:

Figure 1 is a side view.

Figures 2 and 3 are views of details on opposite ends of Figure 1.

Figure 4 is a top view.

Figure 5 is an opened view of details in Figure 1.

Figure 6 is a cross-section view from the line Vil- V12` in Figure 1.

15 Figure 'i is a separated detail view from Figure 1.

One way of gauging the thread oi a pipe coun pling is by means However, it can not be used to gauge a coupling having an inside diameter less than the distance between its operating stems. The present invention enables its use with practically any sized coupling.

Such an indicator 1 is fastened to a frame 2 by means of small screws which engage the formers back.

This frame 2 mounts a bar 3. It also mounts a swinging finger 4 whose remote extremity is provided with a point 5 and whose upper portion engages an loperating stem 1a of the indicator 1.

The bar 3 slidably mounts a xed finger 6 whose lower extremity is also provided with a point 5a. This finger may be locked at various points apart from the swinging finger by means of a thumbscrew 7.

The frame 2 may slidably mount the bar 3 and be provided with a thumbscrew '7a for locking it in position. This enables the substitution of bars of different lengths when desirable. Also, the frame mounts a flat spring 8 which presses against alower portion of the finger 4 with a force which slightly overbalances the push of the indicators operating stem 1e.

It is to be understood that the indicator 1 is a commercial product and that its operating stems are urged outwardly by one or more springs forming part of its operating mechanism. Also, that its indicating dial may be turned by a knurled ring 1b so that the zero can be registered with its pointer.

l In operation, the finger 6 is adjusted on the graduated bar 3 according to the inside diameter ofthe particular coupling to be gauged. The fingers 4 and 6 are then inserted in the coupling so 55 their points 5 and 5 engage diametrlcally oppoof a stem operated indicator.

site hollows of the threads. This is done several times at different places within the coupling and the readings of the indicator 1 noted. Thus, a measure of the comparative internal diameters of the coupling is obtained and its taper angle 6D or variances indicated. The indicators dial is, of course, initially set to zero position.

The particular mounting of the swinging :linger 4 is important because any looseness might introduce inaccuracies.

This mounting is by Way of a circular projection 4EL forming an integral part of the finger 4. It is somewhat more than a semicircle, and fits in a similarly shaped recess 2 in the frame 2. Thus, the wearing surfaces are along the edges of the projection 4u and the recess 2, instead of being restricted to a pivoting pin.

Bearing plates 4b are secured on either side oi the projection 4a by small screws. In addition, they increase the edge-contacting surface area.

A plate 2b retains these parts in place and incidentally forms part of the mounting for the bar 3. The frame 2 is further provided with a forked end 2c which encompasses the upper end of the finger 4 so itis held in engagement with the operating stem 1 of the indicator 1, and also protects the fingers mounting to some extent.

The above construction provides for wear at practically all places it might possibly occur. The points 5 and 5 are screw-mounted and may be removed when worn or damaged.

Preferably, the upper portion of the finger 4 projects sufficiently to form a finger holdl Whereby the fingers lower end may be easily swung towards the other finger to permit free insertion in the coupling. The mounting for the nger 4 is further strengthened by a screw-pin 9 which, with the screws 9*. mounts the plate 2b to the frame 2.

While I have shown and described one specific form of this inventionin accordance with the patent statutes, it is not intended to limit the scope of the invention exactly thereto, except as defined by the following claims.

I claim: v

1. A gauge including an indicator and fixed and swinging fingers operatively associated therewith, the mounting for said swinging finger including the combination of a circular projection thereon which exceeds a semicircle, bearing plates shaped substantially like said projection and removably xed to both sides thereof in registration therewith, a frame having a recess shaped to laterally receive said projection and bearing plates and '110 means for holding said projection and bearing plates in said recess. l

2. A gauge including the combination of an indicator having an operating stem urged outward- 5 1y, a frame fastened to the back of said indicator,

a bar mounted by said frame, a fixed iinger slidably mounted by said bar and provided with locking means, a swinging nger mounted by said trame and including a portion. engaging the operl0 ating stem ot said indicator. and a spring engaging said finger and urging it to engage said operating stem with a force slightly overbalancing 

